Authentication email has already been sent, please check your email box: and activate it as soon as possible.
You can login to My Profile and manage your email alerts.
If you haven’t received the email, please:
|
|
There are 37 papers published in subject: > since this site started. |
Select Subject |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
1. Environmental and spatial effects on the Qinghai-Tibet plateau plant community species composition | |||
Jia Peng,Jia Peng,Ma Yanqi,Du Guozhen | |||
Biology 08 November 2018 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Community structure is the focus of community ecology. Comparing the relative contribution of environmental and spatial variables on species composition is essential to understand the process of community assembly. In this study, we explored that the effects of regional spatial scale, local spatial scale and environmental variables on the species composition of meadow and steppe on the Qinghai-Tibet plateau. The results showed that environmental, regional and local spatial scale variables had significant effects on meadows and their functional groups, and the explanation of local spatial variables was relatively high. And the regional spatial scale variable had a significant effect on the species composition of the steppes and their functional groups. In addition, the total explanation of environmental and spatial variables accounted the highest for the legume groups species composition at the sample sites. And the sum of the explanation of impact factors on meadow functional groups was not equal to the effect on meadow species composition, and the same phenomenon in the steppe. The results demonstrated that environmental and spatial variables and the division of functional groups could fully detect and explain the species composition of community on the Qinghai-Tibetan Plateau. | |||
TO cite this article:Jia Peng,Jia Peng,Ma Yanqi, et al. Environmental and spatial effects on the Qinghai-Tibet plateau plant community species composition[OL].[ 8 November 2018] http://en.paper.edu.cn/en_releasepaper/content/4746329 |
2. Habitats availability for wintering waterbirds as a response to water level in the Shengjin Lake, a newly designated Wetland of International Importance in China | |||
Li Chunlin | |||
Biology 03 May 2017 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Wetland losses and degradations worldwide have resulted in dramatic declines of wetland-dependent waterbirds populations and their habitats. Effective conservation plans to provide essential habitats for waterbirds in periodically inundated wetlands should be based on a deep understanding of the strong relationship between habitat availability and the hydrological regime. Based on waterbirds survey and remotely sensed image classification at various water levels, we investigated how habitat availability for wintering waterbirds responded to water level fluctuation in the Shengjin Lake, a newly designated Wetland of International Important in the middle and lower Yangtze River floodplain, China. During the field survey in the winter 2014-2015, we recorded up to 38 564 individuals of 47 waterbirds species, which could be categorized into four foraging guilds that primarily occur on grassland, mudflat, shallow water or deep water. Habitat availability for wintering waterbirds of all foraging guilds exhibited significant responses to the seasonal water level fluctuation in the lake. At high water level, deep water dominated the lake and could reach up to the peak of 14 500 ha. Along with the water recession during the wintering period, riparian grounds were gradually exposed to provide habitats for waders, shorebirds and geese, which could occupy more than 50% of the lake. The water level fluctuation also affected the landscape metrics, specifying in the increased diversity and decreased fragmentation of the riparian habitats during the water recession period. The artificial regulation of water level, however, changed the natural transition between aquatic habitats which would ultimately affect waterbirds diversity and distribution. We suggest stepwise water recession plans to facilitate waterbird conservation in the lacustrine wetlands in the Yangtze River floodplain, together with recovery of aquatic vegetation community, to synchronize exposure of foraging habitats with migration phonologies of different waterbirds guilds. | |||
TO cite this article:Li Chunlin. Habitats availability for wintering waterbirds as a response to water level in the Shengjin Lake, a newly designated Wetland of International Importance in China[OL].[ 3 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732055 |
3. Seed germination behaviour of six phylogenetically-related Caragana species reveals small phylogenetic constraints, but a strong relationship to the environment in which they evolved | |||
Wei-Nan Zhao,Xiang-Wen Fang | |||
Biology 16 December 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The seed-germination of the six phylogenetically-related Caragana species that thrive in arid to humid regions was investigated in a series of controlled temperature and water regimes. C. korshinskii (from an arid area), C. intermedia and C. microphylla (from semi-arid areas) had rapid seed germination, a high final seed germination percentage (GP), a large decrease in GP with an increase in temperature, but germinated at water/osmotic potentials as low as -1.2 MPa. However, C. arborescens and C. biosi (from semi-humid areas) had slow seed germination, a low final GP, which did not change with increase in temperature, and had no seed germination at water/osmotic potentials below -1.0 MPa. Seeds of C. stipatata (from a humid area) did not germinate until the seed coat was cracked after cold (4 C) had been imposed for 18 months. Using light microscopy, gaps were observed between the macrosclereids of the seed coat of species from the arid, semi-arid, and one species from the semi-humid areas (C. arborescens), but not the second species from semi-humid area (C. biosi). Gaps were not observed between the brachysclereids of the species from the humid area. The results showed that seed germination behaviour was not strongly conserved phylogenetically in the Caragana genus, but was strongly related to their seed coat structure and the environment in which they evolved. We conclude that the observed seed germination responses play an important role in determining the distribution of these species in the different environments of China. | |||
TO cite this article:Wei-Nan Zhao,Xiang-Wen Fang. Seed germination behaviour of six phylogenetically-related Caragana species reveals small phylogenetic constraints, but a strong relationship to the environment in which they evolved[OL].[16 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4671812 |
4. Inferring Caragana adaptive dispersion:from central to Asian to east Asia | |||
Guang-Qian Yao,Xiang-Wen Fang | |||
Biology 16 December 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:The genus Caragana are mostly native to temperate Central and East Asia, occurs in arid, semiarid, semihumid and humid belts. Dehydration tolerance, root mass fraction and deep root system were studied from arid species (C. korshinskii), semiarid species (C. intermedia and C. Microphylla), semihumid species (C. aborescens and C. Biosi) and humid species (C. stipatata and C. sinica) to investigate their adaptive radiation. The results showed that semihumid and humid species had similar dehydration tolerance, the ratio of root to aboveground biomass, and deep root system to drought tolerance to arid and semi arid species. These drought tolerance traits give a strong evident to support that the direction of adaptive radiation of Caragana is from the Central Asia to East Asia, from the arid belt to the humid belt.????? | |||
TO cite this article:Guang-Qian Yao,Xiang-Wen Fang. Inferring Caragana adaptive dispersion:from central to Asian to east Asia[OL].[16 December 2015] http://en.paper.edu.cn/en_releasepaper/content/4671800 |
5. The present situation and rationality of the nature reserves in Inner Mongolia plateau | |||
Ma Wenjing,Kang Sarula,Ding Yong,Zhang Qing | |||
Biology 21 September 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract: A number of nature reserves were set in Inner Mongolia plateau to protect the rich animal and plant resources as well as the ecosystem diversity in this region. With the growing of the number and area of the nature reserves, it is necessary to profoundly research the present situation of the nature reserves and the rationality of the vegetation types protected. This study analyzed the present situation of the reserves, the protection situation of vegetation, and the human interferences of 184 nature reserves in Inner Mongolia plateau established by the end of 2011. The results showed that: (1) the total area of nature reserves are 13,800 km2 in Inner Mongolia Autonomous Region, accounting for 11.67% of the land area in this region. (2)The reserves in this region showed a sharp increase in number and area since l995. And it was different for nature reserves of country, province and county levels. (3)For quantity, the reserves are mainly in forest and inland wetlands ecosystem. For area, desert, inland wetlands and forest ecosystem were dominant. (4)The protected area of 6 vegetation types of total 11 types are less than 10%, indicated the insufficient protection on these vegetation types. (5) The reserves are subject to human disturbance in different degrees as well, thus it need more efforts on the protection of these types. | |||
TO cite this article:Ma Wenjing,Kang Sarula,Ding Yong, et al. The present situation and rationality of the nature reserves in Inner Mongolia plateau[OL].[21 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4654669 |
6. Functional redundancy instead of species redundancy determines community stability in the Inner Mongolia typical grassland | |||
Saruul Kang,Wenjing Ma,Qing Zhang,Jianming Niu,Yong Ding,Fang Han,Xiaoli Sun | |||
Biology 14 September 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Since the redundancy hypothesis was proposed, scholars have believed that the redundancy is able to improve stability. However, in recent years, a positive correlation between redundancy and stability has been questioned by a number of studies. We analyzed data from a field experiment conducted in a typical grassland in northern China to explore the relationship between species redundancy, functional redundancy and the community stability based on a gradient of resource supplement caused by micromorphology, aiming to clarify whether community redundancy is able to improve community stability, as well as the relative importance of species redundancy and functional redundancy in maintaining the community stability. Our results reveal that: (1) The community stability gradually increases with increasing resource supply; (2) The species redundancy is positively but not significantly correlated with the functional redundancy; (3) Further studies found that the relationship between species redundancy and functional redundancy with community stability tends to support the redundancy hypothesis, and the functional redundancy prone to play a more decisive role in community stability. | |||
TO cite this article:Saruul Kang,Wenjing Ma,Qing Zhang, et al. Functional redundancy instead of species redundancy determines community stability in the Inner Mongolia typical grassland[OL].[14 September 2015] http://en.paper.edu.cn/en_releasepaper/content/4654832 |
7. Will accumulation of phosphorus change soil from a carbon sink to a carbon source? | |||
Zhiping Cao | |||
Biology 20 January 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Soil is known to be the largest organic carbon reservoir in the terrestrial biosphere, and plays a crucial role in the terrestrial carbon cycle. In this study, two field experiment sites were selected in Quzhou County, Hebei Province and Shouguang County, Shandong Province, respectively. Both sites are located in the North Plain of China. Investigations were conducted in three types of lands: a farmland (FA); a greenhouse (GH), and a fallow land with no farming practices (FL). The results indicated that in these fields, volume of soil fungi declined with the accumulation of phosphorus. Former research shown that while the fungi biomass decreased in soil, the biomass in the bacterial pathway of the soil food web bloomed and caused an increase in labile organic carbon fraction. It can be speculated that high levels of phosphorus will increase the emission of CO2 and other greenhouse gasses from soil, changing agricultural soil from a carbon sink to a carbon source, and enhance the climate warming. In this case, the soil organic matter content will decline. In Northern East Plain and the Northern Plain of China, the available phosphorus level in soil is remarkably higher than in other areas in China. So that, the sustainable productivity in these two grain bases will be seriously threatened. | |||
TO cite this article:Zhiping Cao. Will accumulation of phosphorus change soil from a carbon sink to a carbon source?[OL].[20 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4630329 |
8. Is the ultimate objective of development for an ecosystem to improve its energy utilization efficiency? | |||
CAO Zhiping | |||
Biology 16 January 2015 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:A hypothesis was proposed as "life evolution route is the process of elevating energy efficiency. The ultimate objective of development for an ecosystem is to improve its energy utilization efficiency". Based on this suppose, the biological community emerged in later geological era should has higher energy utilization efficiency than those emerged earlier. In this paper, the hypothesis is primarily proved by the evidence of higher net primary productivity in terrestrial ecosystems than in aquatic ecosystems. It was found that ecosystem's energy utilization efficiency was closely related with the ecosystem structure. Energy utilization efficiency increased with the trophic levels and the number of functional groups in ecosystems or food webs. Soil food web's energy utilization efficiency is higher than in cultivation-husbandry food webs and ocean cost food webs. In addition, relationship among productivity, diversity and stability was discussed. I prefer to believe that although diversity and stability is the necessary phenomenon on the evolution road, the ultimate objective of an ecosystem is neither improving its diversity nor improving its stability, but elevating its energy utilization efficiency. This is the highest principle for the existence. | |||
TO cite this article:CAO Zhiping. Is the ultimate objective of development for an ecosystem to improve its energy utilization efficiency?[OL].[16 January 2015] http://en.paper.edu.cn/en_releasepaper/content/4629788 |
9. Intensive Agriculture and Soil Biodiversity: Hypothesis and Progress | |||
CAO Zhiping | |||
Biology 06 November 2014 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Since Grill et al proposed a global hypothesis on agricultural intensification, soil biodiversity and ecosystem function in 1997, there had been not a confirm answer. Recent research founded that intensive application of phosphorus fertilizers results in a reduction in fungi leading to a loss of soil organic carbon stability detrimental to sustained productivity. Changes in soil biodiversity could be detected before loss in function as early warning signals, and the reduction or extinction of key functional groups could be used as indicators of soil degradation. According to our observation on the change of protozoa community structure in greenhouse soil, it could be inferred that high concentration phosphorus maybe result in the decline of zooplankton biomass in ocean, and leading to the marine fishing productivity decrease. So that in future, researches on biodiversity and energy flow of food webs in aquatic ecosystems need to be strengthened. | |||
TO cite this article:CAO Zhiping. Intensive Agriculture and Soil Biodiversity: Hypothesis and Progress[OL].[ 6 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4617383 |
10. Agricultural soil food webs indicating organic carbon sequestration | |||
Zhiping CAO | |||
Biology 06 November 2014 | |||
Show/Hide Abstract | Cite this paper︱Full-text: PDF (0 B) | |||
Abstract:Soil carbon sequestration was recognized as having great potential to balance the CO2 emission from fossil fuel. Here, I studied a field site in the winter wheat - summer maize rotation agroecosystem in the Northern China Plain, where fertilization experiments had been conducted in 1993 and 1995. Three fertilizer regimes were imposed: organic fertilizer (OF), chemical fertilizer (CF), and unfertilized (U) plots, which served as a control. In 2010, the investigation area was expanded from the fertilizer experiment to a farmland tillage experiment and a vegetable greenhouse experiment, and a fallow plot was used as a blank control. The results indicated that the application of fertilizers, especially organic fertilizer, changed the soil food web structure and increased the biomass and mineralization rate in the bacterial pathway, resulting in the increase of active organic carbon components and the shift of sequestrated organic carbon into unstable carbon. | |||
TO cite this article:Zhiping CAO. Agricultural soil food webs indicating organic carbon sequestration[OL].[ 6 November 2014] http://en.paper.edu.cn/en_releasepaper/content/4616736 |
Select/Unselect all | For Selected Papers |
Saved Papers
Please enter a name for this paper to be shown in your personalized Saved Papers list
|
|
About Sciencepaper Online | Privacy Policy | Terms & Conditions | Contact Us
© 2003-2012 Sciencepaper Online. unless otherwise stated